Data update

Task/Hash-join/Pluto/hash-join.pluto

@@ -0,0 +1,45 @@
+local fmt = require "fmt"
+
+class A
+    function __construct(public age, public name)
+    end
+end
+
+class B
+    function __construct(public character, public nemesis)
+    end
+end
+
+local tableA = {
+    new A(27, "Jonah"),  new A(18, "Alan"), new A(28, "Glory"),
+    new A(18, "Popeye"), new A(28, "Alan")
+}
+
+local tableB = {
+    new B("Jonah", "Whales"), new B("Jonah", "Spiders"), new B("Alan", "Ghosts"),
+    new B("Alan", "Zombies"), new B("Glory", "Buffy")
+}
+
+local h = {}
+local i = 1
+for tableA as a do
+    local n = h[a.name]
+    if n then
+        n:insert(i)
+    else
+        h[a.name] = {i}
+    end
+    i += 1
+end
+
+print("Age  Name   Character Nemesis")
+print("---  -----  --------- -------")
+for tableB as b do
+    local c = h[b.character]
+    if c then
+        for c as j do
+            local t = tableA[j]
+            fmt.print("%3d  %-5s  %-9s %s", t.age, t.name, b.character, b.nemesis)
+        end
+    end
+end